sensitive

from The American Heritage® Dictionary of the English Language, 5th Edition.

• adjective Capable of perceiving with a sense or senses.
• adjective Responsive to external conditions or stimulation; having sensation.
• adjective Susceptible to slight differences or changes in the environment.
• adjective Readily altered by the action of an agent.
• adjective Registering slight differences or changes of condition. Used of an instrument.
• adjective Easily irritated.
• adjective Predisposed to inflammation as a result of preexisting allergy or disease.
• adjective Aware of or careful about the attitudes, feelings, or circumstances of others.
• adjective Easily hurt, upset, or offended.
• adjective Fluctuating or tending to fluctuate, especially in price.
• adjective Of or relating to secret or classified information.
• noun A sensitive person.
• noun One held to be endowed with psychic or occult powers.

from The Century Dictionary.

• Of, pertaining to, or affecting the senses; depending on the senses.
• Having sense, sensibility, or feeling; capable of receiving impressions from external objects: often extended, figuratively, to various inanimate objects.
• Of keen sensibility; keenly susceptible of external influences or impressions; easily and acutely affected or moved by outward circumstances or impressions: as, a sensitive person, or a person of sensitive nature: figuratively extended to inanimate objects.
• Specifically
• In entomology, noting parts of the surface of the antennæ: which are peculiarly modified and, it is supposed, subservient to some special sense. These surfaces exhibit an immense number of microscopical pores, covered with a very delicate transparent membrane; they may be generally diffused over the joints or variously arranged in patches, the position of which has been used in the classification of certain families of Coleoptera.
• Susceptible in a notable degree to hypnotism; easily hypnotized or mesmerized.
• Noting a condition of feverish liability to fluctuation: said of markets, securities, or commodities.
• So delicately adjusted as to respond quickly to very slight changes of condition: said of instruments, as a balance.
• In chem. and photography, readily affected by the action of appropriate agents: as, iodized paper is sensitive to the action of light.
• Sensible; wise; judicious.
• Synonyms and Sentient, etc. See sensible.
• noun Something that feels; a sensorium.
• noun A sensitive person; specifically, one who is sensitive to mesmeric or hypnotic influences or experiments. See I., 3 .
• noun the common sense in the Aristotelian use.

from the GNU version of the Collaborative International Dictionary of English.

• adjective Having sense of feeling; possessing or exhibiting the capacity of receiving impressions from external objects.
• adjective Having quick and acute sensibility, either to the action of external objects, or to impressions upon the mind and feelings; highly susceptible; easily and acutely affected.
• adjective (Mech.) Having a capacity of being easily affected or moved.
• adjective (Chem. & Photog.) Readily affected or changed by certain appropriate agents.
• adjective rare Serving to affect the sense; sensible.
• adjective Of or pertaining to sensation; depending on sensation.
• adjective (Bot.) an American fern (Onoclea sensibilis), the leaves of which, when plucked, show a slight tendency to fold together.
• adjective (Physics) a gas flame so arranged that under a suitable adjustment of pressure it is exceedingly sensitive to sounds, being caused to roar, flare, or become suddenly shortened or extinguished, by slight sounds of the proper pitch.
• adjective (Bot.) an annual leguminous herb (Æschynomene hispida), with sensitive foliage.
• adjective paper prepared for photographic purpose by being rendered sensitive to the effect of light.
• adjective (Bot.) Any plant showing motions after irritation, as the sensitive brier (Schrankia) of the Southern States, two common American species of Cassia (C. nictitans, and C. Chamæcrista), a kind of sorrel (Oxalis sensitiva), etc.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• adjective Having the faculty of sensation; pertaining to the senses.
• adjective Responsive to stimuli.
• adjective Of a person, easily offended, upset or hurt.
• adjective Of an issue, capable of offending, upsetting or hurting.
• adjective Accurate (instrument)
• noun One with a paranormal sensitivity to something that most cannot perceive.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun someone who serves as an intermediary between the living and the dead
• adjective able to feel or perceive